[KAFKA-17147] Improve KRaft add voter handling to tolerate waiting for delayed operations

• Type: Sub-task
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: kraft
• Assignee: José Armando García Sancio
• Reporter: José Armando García Sancio
• Created: 16/Jul/24 16:22
• Updated: 01/Aug/24 18:58

Description

The current implementation for AddVoter returns an REQUEST_TIMED_OUT error anytime it needs to wait for an invariant to be satisfied. From https://cwiki.apache.org/confluence/display/KAFKA/KIP-853%3A+KRaft+Controller+Membership+Changes#KIP853:KRaftControllerMembershipChanges-Handling.3:

 

1. Wait until there are no uncommitted VotersRecord. Note that the implementation may just return a REQUEST_TIMED_OUT error if there are pending operations.
2. Wait for the LeaderChangeMessage control record from the current epoch to get committed. Note that the implementation may just return a REQUEST_TIMED_OUT error if there are pending operations.
3. ...

This algorithm could be improved to wait for the invariant to become true instead of returning a timeout immediately.